Jumbo-kun is the official AI chat character of Jumbo Denki, a vintage clothing store in Kugayama, Tokyo. It has been updated to provide enhanced customer service and local information.

What are the main updates to Jumbo-kun?

The AI foundation has been migrated to Claude 3.5 Sonnet, improving conversational abilities. A new management screen allows staff to manually input local information, and new features like fortune-telling and a tequila database have been added.

How does the new version enhance customer experience?

By integrating real-time local information and staff-updated recommendations, Jumbo-kun can offer more personalized and relevant advice, creating a more engaging shopping experience that goes beyond typical online information.

What is the significance of the local information management screen?

It allows the store to provide hyper-local, up-to-the-minute information about the Suginami area, such as events, local news, and even trivia about regular customers, which is not available through external searches.

When was the new version released?

The new version was released on April 1st, coinciding with the store's 3rd anniversary.

Jumbo-kun, the Official Character of KUGAYAMA JUMBO DENKI, a Vintage Clothing Store in Tokyo, Undergoes Major Update. New Version Released on April 1st for 3rd Anniversary, Combining Local Focus with Cutting-Edge LLM.

Published Mar 31, 2026 12:48 AM ・ Updated Jun 1, 2026 11:57 AM ・ 5 min read ・ Source: PR TIMES

Vintage clothing store Jumbo Denki upgrades its AI character "Jumbo-kun" to Claude 3.5 Sonnet, enhancing its capabilities.

Jumbo Denki (Kugayama, Suginami Ward, Tokyo), a vintage clothing store, will release a new version of its in-store AI chat character, "Jumbo-kun," coinciding with its 3rd anniversary. The AI foundation has been completely migrated from ChatGPT to Claude Sonnet 4.5. Furthermore, a dedicated management screen has been newly established, allowing for manual input of rich local information about Suginami Ward. This enables customers to interact with Jumbo-kun and gain real-time, local information that cannot be found online.

New Jumbo-kun

Old Jumbo-kun

Update Highlights - Complete Migration to Claude Sonnet 4.5: Improved context retention and consistency during voice conversations. By giving the character more specific "personality" such as tone, values, and voice, the "reproducibility of personality" for any setting has been significantly enhanced. - Local Information Management Screen: Staff can manually update information about the area, such as the latest news from shopping streets, seasonal events, and trivia about regular customers, which is not available on the web. Customers can hear this information simply by talking to Jumbo-kun (data operation is contained within the store, independent of external searches). - "Achieving a More Powerful Customer Service Experience": The management screen allows newly arrived items to be registered as "recommended" latest item information. This information is prioritized during response generation. By introducing seasonal recommendations in real-time, a more powerful customer service experience is realized. - Fortune-Telling Function: The fortune-telling mode is automatically activated by detecting triggers such as "Tell my fortune," "Fortune," or "My birthday is Month/Day." - 14 Types of Tequila DB: Provides conversational guidance on taste, characteristics, and recommended ways to enjoy 14 types of tequila. This expands casual conversation within the context of vintage clothing and culture.

At the time of its initial introduction, it was presented as a "store AI character you can talk to" combining ChatGPT, voice recognition, and speech synthesis. This time, the conversational experience has been further evolved through the model refresh and full implementation of local operations.

*Regarding the old Jumbo-kun: https://prtimes.jp/main/html/rd/p/000000002.000113972.html

Experience Image (In-store Conversation Example) <f

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Source: PR TIMES
Category: product_launch

Jumbo-kun, the Official Character of KUGAYAMA JUMBO DENKI, a Vintage Clothing Store in Tokyo, Undergoes Major Update. New Version Released on April 1st for 3rd Anniversary, Combining Local Focus with Cutting-Edge LLM.

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